Enabling and Setting Power Saver Mode:

  1. Tap "Apps" while viewing the home screen
  2. Go to "Settings"
  3. Swipe to "Phone" and tap "Power" > "Power saver"
  4. Mark or clear the boxes associated with the features you wish to enable during Power saving mode
  5. Tap the "Power saver" switch to turn the feature "ON"

Decreasing Screen Brightness and adjusting Timeout Duration:

  1. Tap "Apps" from the home screen
  2. Go to "Settings" and scroll to "Phone"
  3. Tap "Display & gestures"
  4. Tap "Brightness level" and if necessary, clear the "Automatic brightness" check box
  5. Drag the brightness slider to the left to decrease the brightness
  6. Return to the "Display & gestures" menu and tap "Screen timeout"
  7. Select a lower value for the screen timeout like "15 seconds"

Disabling Wi-Fi, Hotspot, Bluetooth and GPS:

NOTE: you should consider disabling Wi-Fi, Bluetooth, Hotspot and GPS whenever these features are not in use. This can have a positive effect on your battery and increase autonomy by the end of the day. To disable them:

  1. Tap "Apps" from the home screen
  2. Go to "Settings"
  3. Tap the switch next to "Wi-Fi" and "Bluetooth" to turn these features "OFF"
  4. Go to "More" > "Mobile network sharing" and disable "Mobile Hotspot"
  5. To disable GPS, return to the "Settings" menu, tap "Location" under "Personal", tap "Mode" and select "Battery saving"

Changing Sync and Background Data Settings for Apps / Accounts:

  1. Go to the phone's "Settings" menu
  2. Tap "Accounts & Sync"
  3. Select an application to turn off background data, then tap the desired account's account name to enable or disable sync (NOTE: options will differ from one type of account to the other)

Minimize the Use of Third Party Apps:

NOTE: Some third party apps can sync data often and perform tasks even when not in use. If you rarely use a certain 3rd party app yet has a big impact on your phone's battery life, you can either disable or uninstall it.

  1. Tap "Apps" from the home screen
  2. Go to "Settings"
  3. Under "Phone" tap "Apps"
  4. Access the "Downloaded" tab
  5. Select the desired app
  6. Tap "Disable" or "Uninstall"
  7. Press "OK" to confirm

Switch from 4G to 2G Connectivity:

  1. From the phone's "Settings" menu go to "Mobile data"
  2. Tap "Network mode"
  3. Select "GSM only" for 2G connectivity
  4. To use 3G, select "WCDMA only"
  5. For 4G LTE, select "GSM / WCDMA auto" or "GSM / WCDMA / LTE auto"

Check for Software Updates:

NOTE: Sometimes smartphone manufacturers and carriers release new software updates that can contain improvements to battery life. To check for updates:

  1. Tap "Apps" and go to "Settings"
  2. Tap "About" under "Phone"
  3. Tap "Software information"
  4. Tap "Check now" and follow the on-screen prompts assuming an update is available

See More: HTC One M9: Tips & Tricks to Improve Battery Life